Seat spring



2 Sheets-Sheet 1. J. S. WOOD. SEAT SPRING.

no Modl.)

No. 593,631. Patented Nov. 16, 1897.

2 Sheets-Sheet 2. J. S. WO0D.

SEAT SPRING (No Model.)

N0.,59'3,631 Patented Nov. 16,1897.

NM & a 55555555 1 E ml my",

Wags-$6.9:

UNITED STATES.

PATENT FFioE.

JOHN STEWART WOOD, OF WALTON-UPON-THAMES, ENGLAND.

SEAT-SPRING.

SPECIFICATION forming part of Letters Patent No. 593,631, dated November 16, 1897.

A plication filed December 11, 1896. Serial No. 615,319. (No model.)

.To all whom it may concern.-

Be it known that 1, JOHN STEWART WOOD, a member of the Royal College of Veterinary Surgeons, a subject of the Queen of Great Britain, residing at Atherstone,Walton-upon- Thames,-in the county of Surrey, England, have invented a certain new and useful Improvement in Seat-Springs, of which the following is a specification, reference being had to the accompanying drawings, and to the letters marked thereon-that is to say:-

The invention relates to a spring-support applicable for various useful purposes-such, for example, as a support for the seats, saddles, or bodies of velocipedes or other roadcarriages, tram-cars, railway-carriages, or the like-and has for its object to obtain a springsupport of a novel character possessing great elasticity and the strength or resistance of which is capable of being regulated according to the load to be carried, as hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a side elevation representing a spring-support constructed according to the present invention. Fig. 2 is an end elevation thereof. Fig. 3 is a plan of the spring-cylinder separately. Fig. 4 is a vertical longitudinal section of thespring-oylinder separately, and Fig. 5 is a transverse section taken on the line of Fig. 4. 1

In the several figures like parts are indicated by similar letters of reference.

Referring to Figs. 1 to 5, a represents a short horizontal bar formed tubular, which constitutes the base of the device, and at a suitable distance above the base-bar a is pro vided a. corresponding bar I), which is supported upon the upper ends of two pairs of links 0, pivotally connected at c with studs or offsets a b. from the bars a and I), while in order to render the base a of sufficient width to give a steady support to the upper bar I) the studs or offsets a at one end of the base-bar a are formed of greater length than the upper studs 1 and the links 0 are bent or cranked accordingly, as shown more particularly at Fig. 2. The frame thus formed assumes approximately the figure of a diamond and its movement is similar to that of a parallel-ruler, and within this diamond and extending diagonally from one end of one horizontal bar 1) to the opposite end of the other horizontal bar a is a rod or-link d, which at one end is pivotally connected, by means of a slotted lug d thereon, with a corresponding lug b fixed to the adjacent horizontal bar I). The other end of the rod or link is connected to a lug d working in the slot 11 and fixed with a piston d located within the tubular bar a, as -hereinafter described.

(1 is a spring which is inclosed within the tubular base-bar a and acts against the piston d ,which is formed of considerable length, sothat it will not be liable to bind in the tubular bar a, and the regulating-piston cl is centrally apertured and threaded to engage a screw-thread 01 upon a rod d which is mounted with capability of revolving in a bearing 01 in the end 01 of the tubular bar a, and the strength or degree of compression of the spring d may be regulated by turning with a spanner the square d and thereby traversing the piston d As an example of the method of fixing the spring-support with its frame or holder and p with the load or object to be carried, the device shown may be provided with lugs g, as shown by the dotted lines.

The device hereinbefore described may be usefully employed as a spring-support for the seats of velocipedes, railway or other carriages, tram-cars, or the like, or for the bodies of carriages or in other situations where other kinds of springs are now used.

When lightness is an object, the device may with advantage be constructed of aluminium.

By the means hereinbefore described a spring-support is obtained which will materially assist to lessen the transmission of shocks or vibrations.

Although the arrangements hereinbefore described represent the preferred forms of the device at the present time, it will be ob vio'us that the details and arrangement of the parts maybe more or less varied without departing from the spirit of the invention.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, I declare that what I claim is-- A spring-support comprising two parallel bars arranged one above the other, and pivotally connectedbylinks arranged at an angle to the bars, the device assuming approximately the figure of a diamond, a bar arranged diagonally within the diamond, and at one end flexibly connected with the extremity of one of the parallel bars, a piston inclosed Within the other parallel bar, and flexibly connected with the diagonal bar, a coiled spring for acting upon the piston so that the force of the spring tends to bring the links to a vertical position, and to resist the elongation of the diamond, a movable abutment for the spring, a screw-threaded aperture'inthe abutment, and a screw engaging such thread and on the exterior of the bar or tube provided with a square or other means for turning the screw and regulating the spring substantially as herein shown and described and for the purpose stated.

JOHN STEWART WVOOD. Vitnesses:

C. MELBOURNE WHITE, 0. H. WHITE. 

